Bill Schmidt 42d43351b2 This patch addresses an ABI compatibility issue with empty aggregate ... parameters. Examples of these are: struct { } a; union { } b[256]; int a[0]; An empty aggregate has an address, although dereferencing that address is pointless. When passed as a parameter, an empty aggregate does not consume a protocol register, nor does it consume a doubleword in the parameter save area. Passing an empty aggregate by reference passes an address just as for any other aggregate. Returning an empty aggregate uses GPR3 as a hidden address of the return value location, just as for any other aggregate. The patch modifies PPCTargetLowering::LowerFormalArguments_64SVR4 and PPCTargetLowering::LowerCall_64SVR4 to properly skip empty aggregate parameters passed by value. The handling of return values and by-reference parameters was already correct. Built on powerpc64-unknown-linux-gnu and tested with no new regressions. A test case is included to test proper handling of empty aggregate parameters on both sides of the function call protocol. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167090 91177308-0d34-0410-b5e6-96231b3b80d8		2012-10-31 01:15:05 +00:00
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Analysis	Remove code to saturate profile counts.	2012-10-29 17:27:39 +00:00
Archive	Mark checkSignature const, and in turn stop casting away const from	2012-09-05 22:09:23 +00:00
AsmParser	Change ForceSizeOpt attribute into MinSize attribute	2012-10-30 16:32:52 +00:00
Bitcode	Move the Attributes::Builder outside of the Attributes class and into its own class named AttrBuilder. No functionality change.	2012-10-15 20:35:56 +00:00
CodeGen	Change signature of function RAFast::spillAll to avoid conversion between	2012-10-31 00:56:01 +00:00
DebugInfo	Reformat and 80-column this. It's not strictly conforming	2012-10-30 21:36:43 +00:00
ExecutionEngine	Fix regression in old-style JIT.	2012-10-30 22:21:55 +00:00
Linker	Move the "findUsedStructTypes" functionality outside of the Module class.	2012-08-03 00:30:35 +00:00
MC	[ms-inline asm] Add support for the TYPE operator.	2012-10-26 18:04:20 +00:00
Object	Add interface for querying object files for symbol values.	2012-10-29 10:47:00 +00:00
Support	APFloat cleanup: Remove now unused "arithmeticOK" logic.	2012-10-29 18:18:44 +00:00
TableGen	Remove exception handling usage from tblgen.	2012-10-25 20:33:17 +00:00
Target	This patch addresses an ABI compatibility issue with empty aggregate	2012-10-31 01:15:05 +00:00
Transforms	Add support for loops that don't start with Zero.	2012-10-31 00:45:26 +00:00
VMCore	Change ForceSizeOpt attribute into MinSize attribute	2012-10-30 16:32:52 +00:00
CMakeLists.txt
LLVMBuild.txt
Makefile